700 13. COLUBRID 
middle portion of Lower California. Mr. Slevin secured 
one at the spring of San Bartolo in the Cape Region. 
Habits—Mocquard states: “Ce serpent vit dans les 
buissons, sur lesquels il se tient ordinairement perché et se 
meut avec une grande agilité.” 
Our specimen was found on the sand in the arroyo at 
San Bartolo. 
156. Elaphe chlorosoma (Giinther) 
Mexican Green Snake 
Coluber chlorosoma GUNTHER, Biologia Centrali-Americana, Rept., 1894, 
p. 115, pl. 41 (type locality, Atoyak and Amula in Guerrero 
and San Ramon in Jalisco, Mexico). 
Elaphe chlorosoma Stone, Proc. Acad. Nat. Sci. Phila, 1811, p. 231; 
SreyneceR & Barpour, Check List N. Amer. Amph. Rept, 1917, 
p- 82. 
Description —Head long, distinct from neck, with some- 
what flattened top, and elongate snout. Body, rather 
slender, a little compressed laterally. Tail tapering, rather 
short. Rostral large, much broader than high, recurved 
but little above, bounded behind by internasal, anterior nasal 
and first labial plates. Plates on top of head are a pair of 
internasals, a much larger pair of prefrontals, a frontal 
usually in contact with preocular and much broader anteriorly 
than behind, a pair of supraoculars very narrow anteriorly, 
and a pair of large parietals. Anterior and posterior nasals 
distinct. True loreal single, elongate, without subloreal. 
Preoculars one. Postoculars two. Temporals small and 
numerous, about three in the first row. Supralabials eight 
or nine, seventh largest, fifth and sixth or fourth and fifth, 
reaching eye. Inferior labials eleven, fifth and sixth largest, 
first pair meeting on median line. Genials in two pairs, the 
posterior longer but very narrow. Scales on body rather small, 
short, smooth, with two apical pits; in 33 rows, those of the 
